Classification of Welles 1949

Or. †Plesiosauria de Blainville 1835 [plesiosaur]
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Fm. †Elasmosauridae Cope 1869 [elasmosaur]
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G. †Alzadasaurus Welles 1943
G. †Aphrosaurus Welles 1943
G. †Elasmosaurus Cope 1868
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†Elasmosaurus morgani Welles 1949
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Invalid names: Discosaurus carinatus Cope 1868 [objective synonym]
G. †Fresnosaurus Welles 1943
G. †Hydralmosaurus Welles 1943
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G. †Hydrotherosaurus Welles 1943
G. †Morenosaurus Welles 1943
G. †Styxosaurus Welles 1943
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†Styxosaurus snowii Williston 1890
G. †Thalassomedon Welles 1943
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